/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:50:21,438 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:50:21,440 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:50:21,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:50:21,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:50:21,466 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:50:21,467 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:50:21,469 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:50:21,471 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:50:21,472 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:50:21,473 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:50:21,474 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:50:21,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:50:21,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:50:21,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:50:21,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:50:21,479 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:50:21,480 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:50:21,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:50:21,484 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:50:21,485 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:50:21,486 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:50:21,488 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:50:21,488 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:50:21,491 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:50:21,502 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:50:21,503 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:50:21,504 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:50:21,504 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:50:21,549 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:50:21,550 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:50:21,552 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:50:21,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:50:21,552 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:50:21,553 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:50:21,553 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:50:21,553 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:50:21,553 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:50:21,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:50:21,554 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:50:21,555 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:50:21,555 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:50:21,555 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:50:21,555 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:50:21,556 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:50:21,556 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:50:21,556 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:50:21,557 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:50:21,557 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:50:21,557 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:50:21,557 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:50:21,558 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:50:21,558 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:50:21,558 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:50:21,558 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:50:21,558 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:50:21,558 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:50:21,559 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:50:21,559 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:50:21,876 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:50:21,888 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:50:21,891 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:50:21,892 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:50:21,893 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:50:21,894 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 15:50:21,956 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78944d15b/bc213699f168427faf8c922f4a297fa4/FLAG6f09b382e [2020-08-21 15:50:22,379 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:50:22,380 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 15:50:22,387 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78944d15b/bc213699f168427faf8c922f4a297fa4/FLAG6f09b382e [2020-08-21 15:50:22,742 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78944d15b/bc213699f168427faf8c922f4a297fa4 [2020-08-21 15:50:22,753 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:50:22,755 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:50:22,757 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:22,757 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:50:22,761 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:50:22,762 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:22" (1/1) ... [2020-08-21 15:50:22,766 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@129c6bb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:22, skipping insertion in model container [2020-08-21 15:50:22,766 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:22" (1/1) ... [2020-08-21 15:50:22,775 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:50:22,795 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:50:22,971 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:22,978 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:50:22,997 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:23,013 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:50:23,014 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23 WrapperNode [2020-08-21 15:50:23,014 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:23,015 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:50:23,015 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:50:23,015 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:50:23,105 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,116 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,124 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,129 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,131 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... [2020-08-21 15:50:23,133 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:50:23,134 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:50:23,134 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:50:23,134 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:50:23,135 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:50:23,208 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:50:23,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:50:23,209 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:50:23,209 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 15:50:23,209 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 15:50:23,210 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:50:23,211 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:50:23,212 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:50:23,477 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:50:23,477 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 15:50:23,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:23 BoogieIcfgContainer [2020-08-21 15:50:23,482 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:50:23,484 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:50:23,484 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:50:23,487 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:50:23,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:50:22" (1/3) ... [2020-08-21 15:50:23,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ab6226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:23, skipping insertion in model container [2020-08-21 15:50:23,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:23" (2/3) ... [2020-08-21 15:50:23,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ab6226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:23, skipping insertion in model container [2020-08-21 15:50:23,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:23" (3/3) ... [2020-08-21 15:50:23,491 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 15:50:23,502 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:50:23,511 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:50:23,531 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:50:23,566 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:50:23,566 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:50:23,566 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:50:23,567 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:50:23,567 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:50:23,567 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:50:23,567 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:50:23,567 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:50:23,591 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 15:50:23,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:50:23,598 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:23,599 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:23,599 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:23,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:23,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 15:50:23,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:23,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485018709] [2020-08-21 15:50:23,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:23,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:23,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:23,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:23,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485018709] [2020-08-21 15:50:23,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:23,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:50:23,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382070413] [2020-08-21 15:50:23,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:50:23,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:23,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:50:23,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:50:23,873 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 15:50:24,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:24,017 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 15:50:24,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:50:24,019 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 15:50:24,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:24,030 INFO L225 Difference]: With dead ends: 59 [2020-08-21 15:50:24,031 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:50:24,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:24,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:50:24,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 15:50:24,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:50:24,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 15:50:24,078 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 15:50:24,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:24,079 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 15:50:24,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:50:24,079 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 15:50:24,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:50:24,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:24,081 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:24,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:50:24,081 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:24,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:24,082 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 15:50:24,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:24,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645937984] [2020-08-21 15:50:24,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:24,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:24,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:24,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:24,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645937984] [2020-08-21 15:50:24,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:24,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 15:50:24,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874407821] [2020-08-21 15:50:24,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:50:24,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:24,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:50:24,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:24,288 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 15:50:24,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:24,506 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 15:50:24,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:50:24,506 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 15:50:24,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:24,508 INFO L225 Difference]: With dead ends: 48 [2020-08-21 15:50:24,508 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 15:50:24,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:50:24,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 15:50:24,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 15:50:24,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 15:50:24,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 15:50:24,534 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 15:50:24,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:24,534 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 15:50:24,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:50:24,534 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 15:50:24,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:50:24,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:24,536 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:24,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:50:24,536 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:24,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:24,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 15:50:24,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:24,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940735746] [2020-08-21 15:50:24,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:24,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:24,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:24,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:24,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940735746] [2020-08-21 15:50:24,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:24,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:50:24,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408530706] [2020-08-21 15:50:24,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:50:24,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:24,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:50:24,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:50:24,772 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 15:50:24,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:24,948 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 15:50:24,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:50:24,949 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 15:50:24,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:24,950 INFO L225 Difference]: With dead ends: 50 [2020-08-21 15:50:24,950 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 15:50:24,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:50:24,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 15:50:24,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 15:50:24,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 15:50:24,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 15:50:24,958 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 15:50:24,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:24,959 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 15:50:24,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:50:24,959 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 15:50:24,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 15:50:24,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:24,960 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:24,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:50:24,961 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:24,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:24,961 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 15:50:24,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:24,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870024087] [2020-08-21 15:50:24,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:24,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:25,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:25,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,239 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:25,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870024087] [2020-08-21 15:50:25,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:25,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:50:25,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872215544] [2020-08-21 15:50:25,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:50:25,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:25,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:50:25,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:50:25,244 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 15:50:25,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:25,464 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 15:50:25,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:50:25,465 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 15:50:25,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:25,467 INFO L225 Difference]: With dead ends: 52 [2020-08-21 15:50:25,467 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 15:50:25,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:50:25,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 15:50:25,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 15:50:25,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 15:50:25,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 15:50:25,475 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 15:50:25,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:25,476 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 15:50:25,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:50:25,477 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 15:50:25,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 15:50:25,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:25,478 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:25,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:50:25,479 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:25,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:25,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 15:50:25,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:25,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541136142] [2020-08-21 15:50:25,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:25,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:25,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:25,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,767 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:25,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541136142] [2020-08-21 15:50:25,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:25,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:50:25,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401803849] [2020-08-21 15:50:25,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:50:25,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:25,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:50:25,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:50:25,770 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 15:50:25,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:25,963 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 15:50:25,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:50:25,963 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 15:50:25,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:25,965 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:50:25,965 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:50:25,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:50:25,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:50:25,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 15:50:25,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 15:50:25,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 15:50:25,972 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 15:50:25,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:25,972 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 15:50:25,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:50:25,973 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 15:50:25,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:50:25,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:25,974 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:25,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:50:25,974 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:25,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:25,975 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 15:50:25,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:25,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604749046] [2020-08-21 15:50:25,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:25,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:26,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:26,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,209 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:26,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604749046] [2020-08-21 15:50:26,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:26,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:50:26,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938846042] [2020-08-21 15:50:26,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:50:26,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:26,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:50:26,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:50:26,212 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 15:50:26,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:26,378 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 15:50:26,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:50:26,379 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 15:50:26,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:26,380 INFO L225 Difference]: With dead ends: 56 [2020-08-21 15:50:26,380 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 15:50:26,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:50:26,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 15:50:26,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 15:50:26,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:50:26,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 15:50:26,386 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 15:50:26,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:26,387 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 15:50:26,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:50:26,387 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 15:50:26,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 15:50:26,388 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:26,388 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:26,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:50:26,389 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:26,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:26,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 15:50:26,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:26,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070832449] [2020-08-21 15:50:26,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:26,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:26,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:26,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,697 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:26,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070832449] [2020-08-21 15:50:26,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:26,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:50:26,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225376078] [2020-08-21 15:50:26,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:50:26,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:26,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:50:26,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:50:26,699 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 15:50:26,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:26,915 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 15:50:26,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:50:26,915 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 15:50:26,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:26,916 INFO L225 Difference]: With dead ends: 58 [2020-08-21 15:50:26,917 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:50:26,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:50:26,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:50:26,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 15:50:26,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 15:50:26,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 15:50:26,927 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 15:50:26,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:26,929 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 15:50:26,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:50:26,929 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 15:50:26,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:50:26,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:26,930 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:26,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:50:26,932 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:26,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:26,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 15:50:26,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:26,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750916359] [2020-08-21 15:50:26,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:26,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:27,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:27,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,267 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:27,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750916359] [2020-08-21 15:50:27,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:27,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:50:27,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822585524] [2020-08-21 15:50:27,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:50:27,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:50:27,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:50:27,269 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 15:50:27,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:27,466 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 15:50:27,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:50:27,467 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 15:50:27,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:27,470 INFO L225 Difference]: With dead ends: 60 [2020-08-21 15:50:27,470 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 15:50:27,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:50:27,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 15:50:27,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 15:50:27,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 15:50:27,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 15:50:27,484 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 15:50:27,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:27,486 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 15:50:27,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:50:27,486 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 15:50:27,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:50:27,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:27,487 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:27,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:50:27,488 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:27,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:27,488 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 15:50:27,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:27,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034611638] [2020-08-21 15:50:27,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:27,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:27,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:27,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,814 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:27,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034611638] [2020-08-21 15:50:27,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:27,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:50:27,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292299646] [2020-08-21 15:50:27,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:50:27,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:50:27,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:50:27,817 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 15:50:28,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:28,057 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 15:50:28,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:50:28,057 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 15:50:28,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:28,058 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:50:28,058 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:50:28,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:50:28,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:50:28,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 15:50:28,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:50:28,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 15:50:28,065 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 15:50:28,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:28,065 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 15:50:28,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:50:28,065 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 15:50:28,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:50:28,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:28,066 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:28,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:50:28,067 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:28,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:28,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 15:50:28,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:28,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040186769] [2020-08-21 15:50:28,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:28,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:28,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:28,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,472 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:28,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040186769] [2020-08-21 15:50:28,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:28,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:50:28,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342070964] [2020-08-21 15:50:28,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:50:28,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:28,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:50:28,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:50:28,475 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 15:50:28,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:28,706 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 15:50:28,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:50:28,706 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 15:50:28,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:28,707 INFO L225 Difference]: With dead ends: 64 [2020-08-21 15:50:28,708 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:50:28,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:50:28,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:50:28,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 15:50:28,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 15:50:28,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 15:50:28,719 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 15:50:28,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:28,719 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 15:50:28,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:50:28,720 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 15:50:28,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 15:50:28,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:28,721 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:28,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:50:28,723 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:28,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:28,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 15:50:28,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:28,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625327097] [2020-08-21 15:50:28,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:28,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:28,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:28,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,809 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 15:50:28,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625327097] [2020-08-21 15:50:28,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:28,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:50:28,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651984543] [2020-08-21 15:50:28,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:50:28,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:28,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:50:28,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:28,812 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 15:50:28,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:28,895 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 15:50:28,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:50:28,896 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 15:50:28,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:28,899 INFO L225 Difference]: With dead ends: 65 [2020-08-21 15:50:28,899 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 15:50:28,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:28,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 15:50:28,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 15:50:28,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:50:28,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 15:50:28,917 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 15:50:28,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:28,917 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 15:50:28,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:50:28,917 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 15:50:28,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:50:28,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:28,918 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:28,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:50:28,919 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:28,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:28,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 15:50:28,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:28,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680109552] [2020-08-21 15:50:28,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:28,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:28,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:28,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,002 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 15:50:29,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680109552] [2020-08-21 15:50:29,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:29,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:50:29,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094187745] [2020-08-21 15:50:29,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:50:29,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:29,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:50:29,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:29,005 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 15:50:29,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:29,109 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 15:50:29,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:50:29,109 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 15:50:29,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:29,111 INFO L225 Difference]: With dead ends: 73 [2020-08-21 15:50:29,111 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 15:50:29,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:50:29,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 15:50:29,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 15:50:29,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:50:29,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 15:50:29,121 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 15:50:29,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:29,121 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 15:50:29,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:50:29,121 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 15:50:29,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:50:29,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:29,127 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:29,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:50:29,127 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:29,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:29,128 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 15:50:29,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:29,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452373941] [2020-08-21 15:50:29,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:29,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:29,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:29,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,234 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 15:50:29,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452373941] [2020-08-21 15:50:29,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:29,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:50:29,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100721149] [2020-08-21 15:50:29,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:50:29,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:29,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:50:29,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:29,237 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 15:50:29,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:29,312 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 15:50:29,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:50:29,313 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 15:50:29,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:29,313 INFO L225 Difference]: With dead ends: 69 [2020-08-21 15:50:29,314 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:50:29,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:50:29,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:50:29,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:50:29,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 15:50:29,325 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 15:50:29,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:29,325 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 15:50:29,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:50:29,326 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 15:50:29,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:50:29,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:29,327 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:29,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:50:29,328 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:29,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:29,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 15:50:29,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:29,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602862273] [2020-08-21 15:50:29,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:29,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:29,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:29,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,843 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:29,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602862273] [2020-08-21 15:50:29,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:29,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:50:29,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304155701] [2020-08-21 15:50:29,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:50:29,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:29,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:50:29,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:50:29,846 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 15:50:30,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:30,071 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 15:50:30,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:50:30,072 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 15:50:30,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:30,073 INFO L225 Difference]: With dead ends: 74 [2020-08-21 15:50:30,073 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:50:30,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:50:30,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:50:30,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 15:50:30,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 15:50:30,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 15:50:30,079 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 15:50:30,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:30,080 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 15:50:30,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:50:30,080 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 15:50:30,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:50:30,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:30,081 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:30,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:50:30,081 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:30,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:30,082 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 15:50:30,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:30,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868590317] [2020-08-21 15:50:30,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:30,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:30,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:30,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,547 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:30,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868590317] [2020-08-21 15:50:30,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:30,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:50:30,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829575511] [2020-08-21 15:50:30,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:50:30,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:30,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:50:30,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:50:30,550 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 15:50:30,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:30,781 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 15:50:30,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:50:30,781 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 15:50:30,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:30,782 INFO L225 Difference]: With dead ends: 76 [2020-08-21 15:50:30,782 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 15:50:30,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:50:30,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 15:50:30,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 15:50:30,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 15:50:30,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 15:50:30,788 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 15:50:30,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:30,789 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 15:50:30,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:50:30,789 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 15:50:30,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:50:30,790 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:30,790 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:30,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:50:30,790 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:30,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:30,791 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 15:50:30,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:30,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332747710] [2020-08-21 15:50:30,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:30,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:30,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:31,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332747710] [2020-08-21 15:50:31,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:31,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:50:31,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760321746] [2020-08-21 15:50:31,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:50:31,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:31,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:50:31,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:50:31,338 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 15:50:31,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:31,588 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 15:50:31,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:50:31,589 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 15:50:31,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:31,590 INFO L225 Difference]: With dead ends: 78 [2020-08-21 15:50:31,590 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 15:50:31,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:50:31,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 15:50:31,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 15:50:31,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:50:31,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 15:50:31,596 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 15:50:31,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:31,596 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 15:50:31,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:50:31,597 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 15:50:31,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 15:50:31,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:31,598 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:31,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:50:31,598 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:31,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:31,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 15:50:31,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:31,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90801059] [2020-08-21 15:50:31,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:31,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:31,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:31,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,226 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:32,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90801059] [2020-08-21 15:50:32,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:32,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:50:32,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028896400] [2020-08-21 15:50:32,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:50:32,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:32,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:50:32,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:50:32,229 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 15:50:32,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:32,455 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 15:50:32,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:50:32,456 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 15:50:32,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:32,457 INFO L225 Difference]: With dead ends: 80 [2020-08-21 15:50:32,457 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 15:50:32,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:50:32,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 15:50:32,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 15:50:32,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 15:50:32,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 15:50:32,463 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 15:50:32,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:32,463 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 15:50:32,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:50:32,464 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 15:50:32,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 15:50:32,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:32,465 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:32,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:50:32,465 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:32,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:32,465 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 15:50:32,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:32,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186592310] [2020-08-21 15:50:32,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:32,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:32,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:32,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,100 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:33,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186592310] [2020-08-21 15:50:33,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:33,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:50:33,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88213] [2020-08-21 15:50:33,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:50:33,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:33,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:50:33,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:50:33,102 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 15:50:33,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:33,375 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 15:50:33,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:50:33,375 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 15:50:33,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:33,376 INFO L225 Difference]: With dead ends: 82 [2020-08-21 15:50:33,376 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 15:50:33,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:50:33,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 15:50:33,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 15:50:33,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 15:50:33,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 15:50:33,382 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 15:50:33,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:33,382 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 15:50:33,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:50:33,382 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 15:50:33,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 15:50:33,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:33,383 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:33,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:50:33,384 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:33,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:33,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 15:50:33,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:33,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718445964] [2020-08-21 15:50:33,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:33,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:33,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:33,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,082 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:34,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718445964] [2020-08-21 15:50:34,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:34,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:50:34,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953241133] [2020-08-21 15:50:34,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:50:34,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:34,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:50:34,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:50:34,085 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 15:50:34,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:34,366 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 15:50:34,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:50:34,372 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 15:50:34,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:34,373 INFO L225 Difference]: With dead ends: 84 [2020-08-21 15:50:34,373 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 15:50:34,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:50:34,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 15:50:34,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 15:50:34,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 15:50:34,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 15:50:34,378 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 15:50:34,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:34,378 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 15:50:34,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:50:34,379 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 15:50:34,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 15:50:34,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:34,379 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:34,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:50:34,380 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:34,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:34,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 15:50:34,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:34,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954399405] [2020-08-21 15:50:34,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:34,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:34,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:34,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:35,297 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:35,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954399405] [2020-08-21 15:50:35,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:35,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:50:35,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712420837] [2020-08-21 15:50:35,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:50:35,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:35,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:50:35,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:50:35,302 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 15:50:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:35,574 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 15:50:35,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:50:35,575 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 15:50:35,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:35,576 INFO L225 Difference]: With dead ends: 86 [2020-08-21 15:50:35,576 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 15:50:35,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:50:35,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 15:50:35,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 15:50:35,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 15:50:35,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 15:50:35,592 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 15:50:35,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:35,592 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 15:50:35,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:50:35,592 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 15:50:35,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 15:50:35,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:35,593 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:35,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:50:35,596 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:35,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:35,596 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 15:50:35,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:35,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777229958] [2020-08-21 15:50:35,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:35,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:35,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:35,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:35,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:35,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,380 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:36,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777229958] [2020-08-21 15:50:36,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:36,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:50:36,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804487654] [2020-08-21 15:50:36,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:50:36,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:36,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:50:36,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:50:36,382 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 15:50:36,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:36,706 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 15:50:36,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:50:36,707 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 15:50:36,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:36,708 INFO L225 Difference]: With dead ends: 88 [2020-08-21 15:50:36,708 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 15:50:36,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:50:36,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 15:50:36,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 15:50:36,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 15:50:36,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 15:50:36,713 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 15:50:36,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:36,713 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 15:50:36,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:50:36,713 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 15:50:36,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 15:50:36,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:36,714 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:36,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:50:36,714 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:36,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:36,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 15:50:36,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:36,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420330309] [2020-08-21 15:50:36,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:36,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:36,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:36,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,629 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:37,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420330309] [2020-08-21 15:50:37,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:37,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:50:37,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053428504] [2020-08-21 15:50:37,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:50:37,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:37,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:50:37,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:50:37,631 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 15:50:37,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:37,932 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 15:50:37,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:50:37,934 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 15:50:37,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:37,935 INFO L225 Difference]: With dead ends: 90 [2020-08-21 15:50:37,935 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 15:50:37,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:50:37,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 15:50:37,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 15:50:37,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 15:50:37,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 15:50:37,940 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 15:50:37,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:37,941 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 15:50:37,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:50:37,941 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 15:50:37,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 15:50:37,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:37,942 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:37,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:50:37,942 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:37,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:37,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 15:50:37,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:37,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784198888] [2020-08-21 15:50:37,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:37,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:37,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:38,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:38,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784198888] [2020-08-21 15:50:38,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:38,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:50:38,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167433371] [2020-08-21 15:50:38,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:50:38,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:38,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:50:38,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:50:38,862 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 15:50:39,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:39,138 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 15:50:39,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:50:39,139 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 15:50:39,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:39,140 INFO L225 Difference]: With dead ends: 92 [2020-08-21 15:50:39,140 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 15:50:39,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:50:39,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 15:50:39,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 15:50:39,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 15:50:39,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 15:50:39,145 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 15:50:39,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:39,145 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 15:50:39,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:50:39,145 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 15:50:39,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 15:50:39,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:39,146 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:39,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:50:39,146 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:39,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:39,146 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 15:50:39,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:39,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833469204] [2020-08-21 15:50:39,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:39,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:39,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:39,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:39,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,112 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:40,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833469204] [2020-08-21 15:50:40,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:40,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:50:40,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908192250] [2020-08-21 15:50:40,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:50:40,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:40,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:50:40,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:50:40,115 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 15:50:40,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:40,456 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 15:50:40,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:50:40,456 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 15:50:40,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:40,457 INFO L225 Difference]: With dead ends: 94 [2020-08-21 15:50:40,458 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 15:50:40,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:50:40,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 15:50:40,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 15:50:40,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 15:50:40,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 15:50:40,464 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 15:50:40,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:40,464 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 15:50:40,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:50:40,464 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 15:50:40,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 15:50:40,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:40,465 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:40,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:50:40,466 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:40,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:40,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 15:50:40,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:40,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318158848] [2020-08-21 15:50:40,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:40,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:40,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:41,700 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:41,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318158848] [2020-08-21 15:50:41,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:41,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 15:50:41,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083841543] [2020-08-21 15:50:41,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 15:50:41,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:41,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 15:50:41,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:50:41,703 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 15:50:42,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:42,057 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 15:50:42,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 15:50:42,058 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 15:50:42,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:42,073 INFO L225 Difference]: With dead ends: 96 [2020-08-21 15:50:42,073 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 15:50:42,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:50:42,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 15:50:42,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 15:50:42,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 15:50:42,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 15:50:42,078 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 15:50:42,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:42,079 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 15:50:42,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 15:50:42,079 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 15:50:42,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 15:50:42,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:42,080 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:42,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:50:42,080 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:42,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:42,080 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 15:50:42,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:42,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991872973] [2020-08-21 15:50:42,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:42,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:42,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:42,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:42,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:42,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:43,184 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:43,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991872973] [2020-08-21 15:50:43,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:43,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 15:50:43,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484596427] [2020-08-21 15:50:43,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 15:50:43,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:43,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 15:50:43,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:50:43,186 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 15:50:43,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:43,415 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 15:50:43,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 15:50:43,415 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 15:50:43,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:43,416 INFO L225 Difference]: With dead ends: 98 [2020-08-21 15:50:43,416 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 15:50:43,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:50:43,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 15:50:43,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 15:50:43,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 15:50:43,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 15:50:43,421 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 15:50:43,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:43,421 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 15:50:43,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 15:50:43,422 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 15:50:43,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 15:50:43,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:43,422 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:43,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:50:43,423 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:43,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:43,423 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 15:50:43,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:43,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569169744] [2020-08-21 15:50:43,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:43,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:43,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:43,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:43,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:43,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:44,585 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:44,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569169744] [2020-08-21 15:50:44,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:44,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 15:50:44,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271480258] [2020-08-21 15:50:44,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 15:50:44,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:44,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 15:50:44,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:50:44,587 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 15:50:44,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:44,933 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 15:50:44,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 15:50:44,934 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 15:50:44,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:44,935 INFO L225 Difference]: With dead ends: 100 [2020-08-21 15:50:44,935 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 15:50:44,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:50:44,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 15:50:44,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 15:50:44,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 15:50:44,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 15:50:44,942 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 15:50:44,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:44,942 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 15:50:44,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 15:50:44,942 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 15:50:44,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 15:50:44,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:44,943 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:44,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:50:44,943 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:44,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:44,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 15:50:44,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:44,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353514100] [2020-08-21 15:50:44,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:44,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:44,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:44,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:45,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:45,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,243 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:46,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353514100] [2020-08-21 15:50:46,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:46,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 15:50:46,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753310993] [2020-08-21 15:50:46,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 15:50:46,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:46,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 15:50:46,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:50:46,246 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 15:50:46,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:46,606 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 15:50:46,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 15:50:46,606 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 15:50:46,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:46,607 INFO L225 Difference]: With dead ends: 102 [2020-08-21 15:50:46,607 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 15:50:46,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:50:46,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 15:50:46,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 15:50:46,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 15:50:46,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 15:50:46,612 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 15:50:46,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:46,612 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 15:50:46,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 15:50:46,613 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 15:50:46,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 15:50:46,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:46,613 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:46,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:50:46,614 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:46,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:46,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 15:50:46,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:46,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582876773] [2020-08-21 15:50:46,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:46,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:46,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:46,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:47,995 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:47,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582876773] [2020-08-21 15:50:47,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:47,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 15:50:47,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732723418] [2020-08-21 15:50:47,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 15:50:47,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:47,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 15:50:47,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:50:47,999 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 15:50:48,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:48,292 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 15:50:48,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 15:50:48,293 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 15:50:48,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:48,293 INFO L225 Difference]: With dead ends: 104 [2020-08-21 15:50:48,294 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 15:50:48,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:50:48,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 15:50:48,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 15:50:48,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 15:50:48,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 15:50:48,299 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 15:50:48,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:48,300 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 15:50:48,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 15:50:48,300 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 15:50:48,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 15:50:48,300 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:48,301 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:48,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 15:50:48,301 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:48,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:48,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 15:50:48,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:48,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440448306] [2020-08-21 15:50:48,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:48,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:48,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:48,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:48,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:48,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:49,701 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:49,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440448306] [2020-08-21 15:50:49,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:49,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 15:50:49,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754936452] [2020-08-21 15:50:49,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 15:50:49,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:49,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 15:50:49,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:50:49,704 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 15:50:50,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:50,129 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 15:50:50,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 15:50:50,130 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 15:50:50,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:50,131 INFO L225 Difference]: With dead ends: 106 [2020-08-21 15:50:50,131 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 15:50:50,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:50:50,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 15:50:50,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 15:50:50,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 15:50:50,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 15:50:50,139 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 15:50:50,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:50,139 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 15:50:50,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 15:50:50,139 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 15:50:50,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 15:50:50,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:50,140 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:50,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 15:50:50,140 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:50,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:50,141 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 15:50:50,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:50,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680657372] [2020-08-21 15:50:50,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:50,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:50,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:50,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:50,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:50,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:51,649 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:51,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680657372] [2020-08-21 15:50:51,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:51,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 15:50:51,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584434774] [2020-08-21 15:50:51,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 15:50:51,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:51,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 15:50:51,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:50:51,651 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 15:50:52,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:52,079 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 15:50:52,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 15:50:52,079 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 15:50:52,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:52,080 INFO L225 Difference]: With dead ends: 108 [2020-08-21 15:50:52,081 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 15:50:52,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:50:52,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 15:50:52,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 15:50:52,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 15:50:52,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 15:50:52,087 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 15:50:52,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:52,087 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 15:50:52,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 15:50:52,087 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 15:50:52,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 15:50:52,088 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:52,088 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:52,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 15:50:52,088 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:52,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:52,089 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 15:50:52,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:52,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565954016] [2020-08-21 15:50:52,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:52,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:52,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:52,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:52,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:52,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:53,643 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:53,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565954016] [2020-08-21 15:50:53,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:53,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 15:50:53,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323544999] [2020-08-21 15:50:53,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 15:50:53,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:53,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 15:50:53,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:50:53,646 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 15:50:54,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:54,098 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 15:50:54,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 15:50:54,099 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 15:50:54,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:54,100 INFO L225 Difference]: With dead ends: 110 [2020-08-21 15:50:54,100 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 15:50:54,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:50:54,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 15:50:54,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 15:50:54,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 15:50:54,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 15:50:54,106 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 15:50:54,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:54,107 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 15:50:54,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 15:50:54,107 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 15:50:54,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 15:50:54,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:54,108 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:54,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 15:50:54,108 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:54,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:54,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 15:50:54,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:54,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192196390] [2020-08-21 15:50:54,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:54,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:54,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:54,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:54,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:55,720 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:55,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192196390] [2020-08-21 15:50:55,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:55,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 15:50:55,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545772511] [2020-08-21 15:50:55,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 15:50:55,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:55,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 15:50:55,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:50:55,722 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 15:50:56,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:56,201 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 15:50:56,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 15:50:56,202 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 15:50:56,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:56,203 INFO L225 Difference]: With dead ends: 112 [2020-08-21 15:50:56,203 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 15:50:56,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:50:56,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 15:50:56,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 15:50:56,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 15:50:56,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 15:50:56,209 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 15:50:56,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:56,210 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 15:50:56,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 15:50:56,210 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 15:50:56,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 15:50:56,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:56,211 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:56,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 15:50:56,211 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:56,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:56,211 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 15:50:56,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:56,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697211288] [2020-08-21 15:50:56,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:56,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:56,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:56,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:56,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:56,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:57,945 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:57,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697211288] [2020-08-21 15:50:57,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:57,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 15:50:57,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358175037] [2020-08-21 15:50:57,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 15:50:57,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:57,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 15:50:57,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:50:57,947 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 15:50:58,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:58,420 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 15:50:58,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 15:50:58,420 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 15:50:58,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:58,421 INFO L225 Difference]: With dead ends: 114 [2020-08-21 15:50:58,422 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 15:50:58,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:50:58,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 15:50:58,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 15:50:58,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 15:50:58,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 15:50:58,428 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 15:50:58,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:58,428 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 15:50:58,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 15:50:58,428 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 15:50:58,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 15:50:58,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:58,429 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:58,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 15:50:58,430 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:58,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:58,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 15:50:58,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:58,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011631576] [2020-08-21 15:50:58,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:58,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:58,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,225 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:00,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011631576] [2020-08-21 15:51:00,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:00,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 15:51:00,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666957978] [2020-08-21 15:51:00,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 15:51:00,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:00,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 15:51:00,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:51:00,228 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 15:51:00,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:00,593 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 15:51:00,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 15:51:00,594 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 15:51:00,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:00,595 INFO L225 Difference]: With dead ends: 116 [2020-08-21 15:51:00,596 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 15:51:00,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:00,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 15:51:00,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 15:51:00,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 15:51:00,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 15:51:00,601 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 15:51:00,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:00,602 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 15:51:00,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 15:51:00,602 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 15:51:00,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 15:51:00,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:00,603 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:00,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 15:51:00,603 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:00,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:00,604 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 15:51:00,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:00,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88941904] [2020-08-21 15:51:00,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:00,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:00,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:00,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:02,540 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:02,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88941904] [2020-08-21 15:51:02,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:02,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 15:51:02,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439496333] [2020-08-21 15:51:02,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 15:51:02,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:02,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 15:51:02,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:02,542 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 15:51:03,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:03,040 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 15:51:03,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 15:51:03,040 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 15:51:03,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:03,042 INFO L225 Difference]: With dead ends: 118 [2020-08-21 15:51:03,042 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 15:51:03,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:03,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 15:51:03,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 15:51:03,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 15:51:03,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 15:51:03,049 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 15:51:03,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:03,049 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 15:51:03,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 15:51:03,049 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 15:51:03,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 15:51:03,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,050 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:03,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 15:51:03,051 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,051 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 15:51:03,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945573226] [2020-08-21 15:51:03,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:03,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:03,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:05,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945573226] [2020-08-21 15:51:05,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:05,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 15:51:05,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132193372] [2020-08-21 15:51:05,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 15:51:05,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 15:51:05,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:05,082 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 15:51:05,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:05,512 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 15:51:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 15:51:05,512 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 15:51:05,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:05,513 INFO L225 Difference]: With dead ends: 120 [2020-08-21 15:51:05,514 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 15:51:05,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:05,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 15:51:05,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 15:51:05,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 15:51:05,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 15:51:05,525 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 15:51:05,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:05,526 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 15:51:05,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 15:51:05,526 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 15:51:05,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 15:51:05,526 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:05,527 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:05,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 15:51:05,527 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:05,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:05,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 15:51:05,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:05,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56607074] [2020-08-21 15:51:05,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:05,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:07,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56607074] [2020-08-21 15:51:07,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:07,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 15:51:07,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684507501] [2020-08-21 15:51:07,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 15:51:07,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:07,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 15:51:07,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:07,633 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 15:51:07,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:07,994 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 15:51:07,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 15:51:07,995 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 15:51:07,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:07,996 INFO L225 Difference]: With dead ends: 122 [2020-08-21 15:51:07,996 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 15:51:07,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:51:07,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 15:51:08,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 15:51:08,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 15:51:08,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 15:51:08,001 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 15:51:08,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,002 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 15:51:08,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 15:51:08,002 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 15:51:08,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 15:51:08,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,003 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:08,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 15:51:08,003 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,004 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 15:51:08,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598198709] [2020-08-21 15:51:08,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:08,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:10,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598198709] [2020-08-21 15:51:10,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:10,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 15:51:10,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649030945] [2020-08-21 15:51:10,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 15:51:10,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:10,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 15:51:10,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:10,204 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 15:51:10,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:10,538 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 15:51:10,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 15:51:10,539 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 15:51:10,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:10,540 INFO L225 Difference]: With dead ends: 124 [2020-08-21 15:51:10,540 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 15:51:10,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:51:10,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 15:51:10,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 15:51:10,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 15:51:10,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 15:51:10,551 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 15:51:10,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:10,551 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 15:51:10,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 15:51:10,551 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 15:51:10,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 15:51:10,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:10,552 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:10,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 15:51:10,552 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:10,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:10,552 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 15:51:10,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:10,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663652130] [2020-08-21 15:51:10,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:10,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:10,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:10,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:12,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663652130] [2020-08-21 15:51:12,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:12,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 15:51:12,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901705451] [2020-08-21 15:51:12,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 15:51:12,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:12,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 15:51:12,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:12,839 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 15:51:13,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:13,206 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 15:51:13,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 15:51:13,206 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 15:51:13,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:13,208 INFO L225 Difference]: With dead ends: 126 [2020-08-21 15:51:13,208 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 15:51:13,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 15:51:13,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 15:51:13,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 15:51:13,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 15:51:13,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 15:51:13,215 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 15:51:13,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:13,215 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 15:51:13,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 15:51:13,216 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 15:51:13,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 15:51:13,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:13,216 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:13,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 15:51:13,217 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:13,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:13,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 15:51:13,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:13,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712475028] [2020-08-21 15:51:13,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:13,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:13,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:13,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:13,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:13,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:15,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:15,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712475028] [2020-08-21 15:51:15,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:15,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 15:51:15,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097069639] [2020-08-21 15:51:15,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 15:51:15,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:15,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 15:51:15,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:51:15,651 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 15:51:16,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:16,111 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 15:51:16,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 15:51:16,111 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 15:51:16,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:16,113 INFO L225 Difference]: With dead ends: 128 [2020-08-21 15:51:16,113 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 15:51:16,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 15:51:16,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 15:51:16,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 15:51:16,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 15:51:16,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 15:51:16,119 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 15:51:16,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:16,120 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 15:51:16,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 15:51:16,120 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 15:51:16,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 15:51:16,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:16,121 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:16,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 15:51:16,121 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:16,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:16,122 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 15:51:16,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:16,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520021866] [2020-08-21 15:51:16,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:16,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:16,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:16,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:16,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:18,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:18,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520021866] [2020-08-21 15:51:18,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:18,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 15:51:18,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747558137] [2020-08-21 15:51:18,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 15:51:18,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:18,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 15:51:18,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:51:18,734 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 15:51:19,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:19,341 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 15:51:19,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 15:51:19,342 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 15:51:19,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:19,343 INFO L225 Difference]: With dead ends: 130 [2020-08-21 15:51:19,343 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 15:51:19,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 15:51:19,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 15:51:19,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 15:51:19,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 15:51:19,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 15:51:19,351 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 15:51:19,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:19,351 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 15:51:19,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 15:51:19,351 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 15:51:19,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 15:51:19,352 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:19,352 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:19,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 15:51:19,352 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:19,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:19,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 15:51:19,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:19,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835743414] [2020-08-21 15:51:19,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:19,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:19,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:19,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:19,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:19,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat